49db9f4f775c2308c31bc3bacf64cd9263f70b55

We were ignoring the possibility that the current modelview matrix may flip the incoming rectangle in which case we didn't calculate a valid scissor rectangle for clipping. This fixes: http://bugzilla.o-hand.com/show_bug.cgi?id=1809 (Clipping doesn't work within an FBO)
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